The British public is increasingly sceptical that human activity is to blame for climate change, a poll for Sky News suggests.
Almost one in five people believes that natural processes rather than man-made carbon dioxide emissions are causing global warming, according to the survey by Sky Data.
In a similar poll by YouGov two years ago, just one in 14 people said humans were not responsible for the problem.
The Sky News poll comes ahead of the United Nations summit in Paris that is likely to result in big cuts in greenhouse gas emissions.
Prime Minister David Cameron will be among almost 150 world leaders attending the talks.
The survey suggests he could struggle to sell a climate deal if it increases household bills.
It shows 54% of the public oppose green taxes on petrol, electricity and imported food.
Just over a third would back extra taxes on products with a high carbon footprint.
The UN wants world leaders to agree a deal that would limit the rise in average global temperature to 2C, regarded by the overwhelming majority of scientists as the danger point for the world’s climate.
That would mean cutting worldwide emissions by 40-70% by 2050 and 100% by the end of the century.